塔克拉玛干沙漠北缘过渡带紫外辐射和总辐射特征/Characteristics of Global Radiation and Ultraviolet Radiation over Desert-oasis Transition Zone of the North Taklimakan Desert[J]

利用塔克拉玛干沙漠北缘沙漠-绿洲过渡带肖塘地区2011年直接探测的辐射资料,对该地区紫外辐射、总辐射状况进行了初步分析.结果表明:紫外辐射、总辐射年变化位相基本相同,年曝辐量分别为242.62、5441.31MJ·m-2,分别比塔克拉玛干沙漠腹地少21％、10％,年平均日曝辐量分别为0.68、15.35 MJ· m-2.总辐射辐照度最大值为1329.6W· m-2,紫外辐射辐照度最大值为62.7 W·m-2,出现在6月.沙尘暴对紫外辐射的减弱作用最明显,扬沙次之,浮尘减弱作用最小.紫外辐射日平均曝辐量占总辐射日平均曝辐量的3.36％～7.25％,年平均曝辐量占4.45％

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^